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Not directy related to the Ultra Space itself, but I really hope they go all in on the "alien invasion/infection" aspect of the Ultra Beast plot, we only got a taste of what they could do with it in Sun and Moon
I loved that plotline of Nihilego infecting the Aether Foundation and brainwashing all the grunts, maybe this time, it can spread even farther and they can go nuts with the design of the infected people and pokemon
Have all the Ultra Beasts come out at once all over the region, show the effects of what they're doing and make it feel like a really high stakes crisis, maybe with multiples of each of them, and show as many characters as possible trying to deal with them (Kukui, Looker, Anabel, Trial Captians, etc.)
Involve Zygarde somehow as the one trying to stop the disaster, and maybe we need to find Necrozma and combine him with the cover legend to put an end to the disaster, and let our player fight droves of the UBs and infected trainers and their pokemon on their way to do it